The Old NetISSUE #2 of 60

why xhtml existed · the strictness pitch

Pixel PeteVSQuirks Mode

Pixel Pete saysXHTML existed to make web pages valid XML so any XML tool could parse them reliably.

Around 2000, the W3C wanted the messy, forgiving HTML to become clean XML — parseable by the same strict tools that handle data feeds and config files. The promise: predictable documents, easier processing, and a path to extensibility. The reality: one tiny error broke the whole page, which proved too brittle for the real web.

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Pitch: pages as valid, tool-parseable XML
Predictability and extensibility were the goals
Strict parsing was the headline feature
Brittleness undermined the vision

Quirks Mode attacks — common mistakes

Believing strictness alone makes better pages
Ignoring why brittleness doomed it
Assuming XML parsing benefits applied to all sites

Boss battleExplain in one line why "predictable parsing" appealed to tool-builders.

Example code

<!doctype html><html><head><meta charset="utf-8"></head>
<body style="background:#06040d;color:#e6e0ff;font-family:monospace;padding:20px"><pre>the pitch:
  HTML  → forgiving, browser-guesses
  XHTML → strict XML, any parser agrees
the catch: one error = whole page fails</pre></body></html>

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